Cylinder-screw.



J. VAN KATWYK.

CYLINDER SCREW.

APPLICATION FILED MAY 25, 1912.

Patented Aug. 19, 1913 a SHEETS-SHEET 1.

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CYLINDER SCREW. APPLICATION FILED MAY 25, 1912.

I 1,070,560. Patented Aug. 19, 1913.

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IACOIBUS VAN" KATWYK, 0F BROOKLYN, NEW YORK.

, ormnnnnrscnnwl Specification of Letters Patent.

. Patented Aug. 19,1913.

Ap'plicationflled Kay 25, 1912. Serial No. 699,733.

To all whom it may concern: 7

Be it known that I, JAooBUs VAN KAT- WYK, a subject of the. Queen of the Netherlands, residing at Brooklyn, in the county 'ofKings and State of New York, have 1nvented certain new and useful Improvements in Cylinder-Screws, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to boats, and the principal object of the same is to provide the boat with a novel type of propelling means which comprises cylinder screws which are mounted in the chambers formed in the hull of the vessel, the chambers being provided with sliding doors so that' the chambers may be closed thus shutting ofi the water from the cylinder screws and permitting the doors of the chambers to be opened from the inside of the boat to permit the cylinder screws to be cleaned when necessary.

This invention is illustrated in the accompanying drawing, wherein Fr' ure l is a side elevation of a ship showing the cylinder screws in position. Fig. 2 is a longitudinal sectional view with the screw housing and doors removed. Fig.

3 is a transverse sectional view through one of the propeller housings. Fig. 4 is a fragmentary longitudinal sectional view through one of-the propeller housings with the doors in position.

Referring to the drawings, it will be seen that this invention comprises a number of cylinder screws which are mounted in the hull 30 of the vessel and are positioned in chambers which are located along the keel of. the boat. Each of these cylinders has its own engine so that if the engine running one of the cylinder screws gets out of order, the boat will not necessarily be stopped as the engines running the remaining cylinder screws will not be interfered with. It will thus be seen that the cylinder screws may be independently cleaned or repaired without it being necessary to stop the remaining screws and also that repairing may be done without it being necessary to stop the ship or to place the ship in dry-dock.

The bottom of .the ship 30 is provided with air-tight bulk-heads 31, which inclose openings formed in the bottom of the ship,

each bulk-head being provided with a watertight closure 32 whlch may be opened when it is desired to enter the bulk-head. Flanges 33 extend from the sides of the opening formed in the bottom of the ship and form supports for the doors 34 and 35 when the doors are lowered. The propeller housing 36 is located within the bulk-head and is supported at each end by the bearings 37 mounted upon the propeller shaft 38. This propeller shaft passes through bearings 39 at the ends of the bulk-head and a driving belt 40 is mounted upon a pulley 41 at the outer end of the shaft. It is of course obvious that, if desired, driving belts may be applied to each end of the propeller shaft.

The doors 34 and 35 are provided with bearings 42 and 43 which are mounted upon the propeller shaft 38 so that the doors will be rotatably mounted. The lower edge of the door 35 is sharpened to form a reduced .edge 44 which fits into a pocket 45 formed in the door 34. The upper portion of each of the doors is provided with an inwardly they are supported by the flanges 46 and 48 which rest upon the flanges 47 and 33. In the preferred form rubber packing strips are mounted upon the flanges '33 and 47 so that when the doors are lowered water-tight joints will be formed between the doors and the supporting flanges. These doors are opened and closed by being rotated upon the propeller shaft, the rotation of the doors being accomplished by the following mechanism:Gurved rack-bars 49 extend from each of the doors and are positioned out of alinement so that the racks may pass each other. The free ends of the rack-bars pass through guides 50 and are operated by gear wheels 51 mounted upon the shafts 52. Each of these shafts 52 is mounted in a bearing 53 carried by the propeller housing and extend through a bearing formed in the bulk-head so that an operating wheel 54 may be mounted upon its outer end. An opening is formed in the upper portion of the propeller housing beneath the opening formed in the bulk-head andv is closed by drawn up into the place between the'pro peller housing and the bulkhead thus exposing the propeller and permittmg it to force the ship forward. When it is desired to examine the propeller, the shafts 52 are rotated so thatthe doors are lowered to the position shown in Fig. 7, the lower ends of the doors interlocking and the doors being supported uponthe rubber packing strips carried by the flanges 33 and ,47. After these doors are lowered, it will, of course, be obvious that the propeller housing and the space between the propeller housing and the bulkhead will be-filled with water. In order to remove this water a pump which is connected with the pipe 56 is set in opera-- tion and the water will be pumped out of the space between the bulkhead and the pro peller housing. The closure 32 can now be opened and the closure 55 then opened so that access may be had to the propeller housing. A suction pump is passed into the propeller housing and the water pumped out. The propeller can then be scraped or repaired. After the propeller has been cleaned the closures 32 and 55 are closed and the doors can then be raised and the propeller started. I

What is claimed is .1. A ship, propeller housings carried by said ship, propellers mounted in said houslugs, and sectional doors between-said propeller and housing, and adapted to be swung down beneath said pro eller.

2. In a ship, a bulkead mounted in the hull thereof, a propeller shaft passing through said bulkead, a propeller housin mounted on said shaft, a propeller carri by said shaft and in said propeller housing, and closures mounted upon said propeller shaft and adapted to be moved from within the space between said propeller housing and said bulk-head to a position-beneath said propeller to close said propellerhousing and the space between said propeller housing and said bulk-head.

3.' A ship having an opening formed in its hull, a bulk-head mounted in the hull of said ship'and inclosin the opening formed therein, a propeller s aft passing through said bulk-head, a propeller housing mounted upon said propeller shaft, flanges formed at the lower edges of said bulk-head and propeller housing, and closures positioned between said bulk-head andsaid propeller housing and adapted to be lowered to rest upon said flanges and having their edges interlocking to close said propeller housing and the space between said propeller housing and said bulk-head.

4. A ship having an opening formed in peller housing, curved rack-bars carried by said closures, shafts mounted between said bulk-head and propeller housing, and gear wheels mounted upon said shafts and meshin with said rack-bars to raise and lower said closures. I

i In testimony whereof I hereunto aflix my signature in presence of two witnesses.

J ACOBUS VAN KATWYK.

Witnesses: I

Prams JOHANNUS Room, Simon Hmnmm SONNEBORN. 

